Lucent Technologies 555-233-119 64 Kbps Calls Terminate but Far End Receives 56 Kbps Indication, Calls Terminate with No Audio

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-92Multimedia Call Handling
1
Before troubleshooting any prob lems associated with the DEFINITY MMCH,
always be sure that the endpoint is operating correctly ( audio, video, and d ata)
by making point-to-p oint test calls. If possib le, make the test calls over the
network to test the connectivity and routing of network calls from the end point.
This eliminates problems such as d isconnected aud io or video cables and
network troubles.
64 Kbps Calls Terminate but Far End Receives
56 Kbps Indication
Description
Some 2x64 Kbps conferences o n the DEFINITY MMCH do not establish because
of framing, audio, or vid eo problems.
For calls that are routed in the network through a Luc ent Technologies/LEC
interface, the originating equipment may launch a 6 4 Kbps call attemp t, and the
far end receives either a 56 Kbp s or 64 Kbps indic ation. If the far end receives a
64 Kbps indic ation, the call may have used 56 Kb ps facilities. If so, the ca ll may
exhibit any of the following c onditions:
■No handshaking in one direc tion or both (call d isconnects after timeouts)
■Call connects, but aud io or video is corrup ted (audio noise or no video)
■Call succeeds without d isruption (this is the least likely since one end point
must be aware that the call is really 56 Kb ps to connect)
If any of the above conditi ons occur, then 64 Kbp s calls from the site are
blocked.
Solution
Administer the conference for c onnection at 56 Kbp s.
Calls Terminate with No Audio
Description
To support endpoints that do not su pport Multipoint Command Conference
(MCC), the DEFINITY MMCH changes its capability set and i nitiates a capability
set exchange with the endp oint when the Selected Communications M ode (SCM)
changes. If the endp oint does not follow the SCM audio mode, the MCU may
include the endp oint as a secondary (audio only) endpoint. If the endp oint sends
an unknown or unsupported audio mode, then the TN788B dec oder port mutes
the endpoint from the conferenc e. The user may hear the conference but may not
be heard by other p arties in the conference.